whats the biggest bore size you can do on a stock 6.0 without having to resleve it?

 

4.080 has been done but not recommended at all!!! A safe max bore would be 4.060, but you need to get your block sonic tested to make sure it can be taken that far. 4.030-4.040 is the most popular bores sizes for the iron block due to it's reliability and leaves room for rebuilds.

 

I have READ (not SEEN) of 6.0's going 4.125"....that seems HUGE to me but I guess it's all in the block casting (at that bore size sonic checking is a MUST)